The picture does not revel anything obvious. While clownfish seem to be prone to brooklynella (aka clownfish disease) most of those types of parasitical diseases are associated with new fish or new fish introductions. Perhaps your dealing with a minor bacterial issues or perhaps some mucus generated by some some other irritation.
Might try to improve the diet and see if a few water changes have a positive impact ... works with many minor bacterial problems. If conditions worsen then QT combined with some antibiotics may help ... at that time another post/pic may help as well.
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